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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Women who have been blind since birth almost never have breast cancer. A high level of one specific hormone is though to contribute to their low cancer rate. Which hormone is it and why are levels of this hormone unusually high in the blind?

Summary Introduction

To determine: The hormone which is present in higher amounts in blind women and protects them from breast cancer. Also explain the reason why it is unusually high in the blind.

Concept introduction: Cancer is a state or a condition where cells grow wildly and uninhibitedly. There are many types of cancers and they are one of the leading causes of death found in humans. One of the most deadly cancers in women is breast cancer. Increased secretion of a hormone called melatonin reduces the risk of breast cancer in women.

Explanation
Some hormones and their level in our body provide a protective effect against breast cancer. Melatonin hormones are produced in the brain by the pineal gland that regulates the sleep and wake cycle in the body. The hormones levels get increased during night and their level gradually decreases when exposed to light. In many westernized and industrialized countries, melanin secretion in the human body diminishes due to increased night-time exposure of artificial light...

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